Sunway Co., Ltd. (SHSE:603333) shares have continued their recent momentum with a 27% gain in the last month alone. Notwithstanding the latest gain, the annual share price return of 3.8% isn't as impressive.

Although its price has surged higher, Sunway's price-to-sales (or "P/S") ratio of 1.8x might still make it look like a buy right now compared to the Electrical industry in China, where around half of the companies have P/S ratios above 2.4x and even P/S above 5x are quite common. However, the P/S might be low for a reason and it requires further investigation to determine if it's justified.

What Does Sunway's Recent Performance Look Like?

For instance, Sunway's receding revenue in recent times would have to be some food for thought. Perhaps the market believes the recent revenue performance isn't good enough to keep up the industry, causing the P/S ratio to suffer. However, if this doesn't eventuate then existing shareholders may be feeling optimistic about the future direction of the share price.

How Is Sunway's Revenue Growth Trending?

In order to justify its P/S ratio, Sunway would need to produce sluggish growth that's trailing the industry.

Retrospectively, the last year delivered a frustrating 15% decrease to the company's top line. The last three years don't look nice either as the company has shrunk revenue by 18% in aggregate. Therefore, it's fair to say the revenue growth recently has been undesirable for the company.

Weighing that medium-term revenue trajectory against the broader industry's one-year forecast for expansion of 25% shows it's an unpleasant look.

With this in mind, we understand why Sunway's P/S is lower than most of its industry peers. Nonetheless, there's no guarantee the P/S has reached a floor yet with revenue going in reverse. Even just maintaining these prices could be difficult to achieve as recent revenue trends are already weighing down the shares.

What Does Sunway's P/S Mean For Investors?

The latest share price surge wasn't enough to lift Sunway's P/S close to the industry median. Using the price-to-sales ratio alone to determine if you should sell your stock isn't sensible, however it can be a practical guide to the company's future prospects.

As we suspected, our examination of Sunway revealed its shrinking revenue over the medium-term is contributing to its low P/S, given the industry is set to grow. Right now shareholders are accepting the low P/S as they concede future revenue probably won't provide any pleasant surprises either. Given the current circumstances, it seems unlikely that the share price will experience any significant movement in either direction in the near future if recent medium-term revenue trends persist.

Before you settle on your opinion, we've discovered 3 warning signs for Sunway (1 is potentially serious!) that you should be aware of.

It's important to make sure you look for a great company, not just the first idea you come across. So if growing profitability aligns with your idea of a great company, take a peek at this free list of interesting companies with strong recent earnings growth (and a low P/E).

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This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.